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How to convert mV to db?

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vrms to dbm formula

Perhaps muaythai2006 refers to dBV or dBmV or dBuV. Then the answer is easy.

V(dBV)=20*log(V(V)/1V)
V(dBmV)=20*log(V(mV)/1mV)
V(dBuV)=20*log(V(uV)/1uV)

V(dBmV)=V(dBV)+30dB
V(dBuV)=V(dBmV)+30dB

log = decimal logarithm
 

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